Xzin

After animation,Memory increase is very slow，but it Is indeed increasing.  

I wrote a simple extension for RxPermissions. ``` import android.annotation.TargetApi import android.content.Intent import android.net.Uri import android.os.Build import android.os.Bundle import android.provider.Settings import androidx.fragment.app.Fragment import androidx.fragment.app.FragmentActivity import com.tbruyelle.rxpermissions2.RxPermissions import io.reactivex.Observable import io.reactivex.subjects.PublishSubject...